<?php
require_once('Zend/View/Helper/Abstract.php');

class Kbs_View_Helper_Substring extends Zend_View_Helper_Abstract
{
    public function substring($string, $sublen, $start = 0, $code = 'UTF-8')
    {
        if($code == 'UTF-8') {
            $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
            preg_match_all($pa, $string, $t_string);
            if (count($t_string[0]) - $start > $sublen) {
                return join('', array_slice($t_string[0], $start, $sublen))."...";
            }
            return join('', array_slice($t_string[0], $start, $sublen));
        } else {
            $start = $start * 2;
            $sublen = $sublen * 2;
            $strlen = strlen($string);
            $tmpstr = '';
            for($i = 0; $i < $strlen; $i++) {
                if ($i >= $start && $i < ($start + $sublen)) {
                    if (ord(substr($string, $i, 1)) > 129) {
                        $tmpstr.= substr($string, $i, 2);
                    } else {
                        $tmpstr.= substr($string, $i, 1);
                    }
                }
                if(ord(substr($string, $i, 1)) > 129) $i++;
            }
            if(strlen($tmpstr) < $strlen ) {
                $tmpstr.= "...";
            }
            return $tmpstr;
        }

    }
}